Abstract: Basins of the west Daxinganling have complicated structures frame-works that a central uplift is sandwiched by two downwarps.Supposing the uplift to be an axis,there exists an opposite migration of a group of step fault blocks which have opposite dips,this migration prompted the uprising and the movement of the sedimentary center from the uplift to both sides.Therefore,the grabens near the uplift were formed earlier and have more complete history of development,larger scales,and a better conditions for oil and gas generation than the further ones.At last,we discussed the effect of the slow uprising of Daxinganling upon the basin conditions of oil generation and reservation,then pointed out that the fault grabens west of the uplift is the most promising area.